5 results about "Anisotropic conductivity" patented technology

The invention discloses an anisotropic conductive adhesive film as well as a preparation method and application thereof. The anisotropic conductive adhesive film is prepared from the following raw materials in parts by mass: 25 to 30 parts of polymer matrix; 0.1 to 1 part of crop fiber; 2-3 parts of a conductive filler; 20-40 parts of an insulating filler; 0.0001 to 0.0005 part of a cross-linking agent; the addition amount of aluminum acetate in the Al < 3 + > emulsion is 1-2 parts. The macroscopic reinforced structure of reinforced concrete and the microcosmic coordination bonding mechanism of mussel byssus are combined for the first time and used for designing the anisotropic conductive adhesive film, and long-term stability of a conductive / insulating structure is achieved. The anisotropic conductive adhesive film prepared by the invention not only has remarkable anisotropic conductivity (low resistance (about 1 ohm) in the vertical direction and high resistance (about 1.2 * 10 < 8 > ohm) in the horizontal direction), but also has high tensile strength (-5.2 MPa), high elongation at break (-354%), high stripping force (-900 gf / mm) and good low temperature resistance and self-repairing capability.

The application provides a method and system for adaptively and optimally selecting background field conductivity in electromagnetic field forward modeling of a horizontal well, wherein the method comprises the following steps: extracting characteristic parameters from a full-tensor anisotropic conductivity tensor of a target formation, and constructing a candidate background conductivity parameter set; calculating a difference spectral domain field corresponding to the candidate background conductivity parameters; performing convergence quantitative analysis on the difference spectral domain field, comprehensively evaluating and ranking each candidate background conductivity parameter based on a convergence evaluation index, and determining an optimal background conductivity parameter; and performing a background field subtraction operation by using the optimal background conductivity parameter to obtain a final calculation result. The method and system for adaptively and optimally selecting background field conductivity in electromagnetic field forward modeling of a horizontal well can automatically identify the optimal background conductivity parameter in formations with different anisotropic types and intensities, improve the convergence of the difference spectral domain field, and improve the electromagnetic field calculation efficiency.

The invention provides an eddy current nondestructive testing finite element analysis method for a woven carbon fiber composite material, and belongs to the technical field of carbon fiber composite material detection.The eddy current nondestructive testing finite element analysis method comprises the steps that the minimum basic unit size of finite element analysis of the woven carbon fiber composite material is obtained; measuring the impedance of the woven carbon fiber composite material in each direction and obtaining the conductivity of the minimum basic unit in each direction; arraying the weft basic module and the warp basic module to obtain a geometric model of the woven carbon fiber composite material; setting the conductivity of weft yarns and warp yarns in the geometric model of the woven carbon fiber composite material to obtain a finite element simulation model; establishing a coil model; performing grid division on the coil and the finite element simulation model; setting eddy current nondestructive testing field domain parameters, and carrying out finite element analysis on the woven carbon fiber composite material. According to the method, electromagnetic field distribution and eddy current detection simulation of the woven carbon fiber composite material can be realized, and the calculation efficiency is improved while the finite element simulation precision is met.

The invention discloses a complex reservoir rock core electrical property evaluation method and system based on an orthotropic electrical theory, and relates to the technical field of oil and gas reservoir exploration theories and application, and the method comprises the following steps: constructing a complex reservoir rock core orthotropic electrical basic model, and determining the orthotropic expression form of conductivity and resistivity tensor; according to the method, an electrical theoretical model based on orthotropic conductivity tensor is constructed, a tensor expression form containing transverse conductivity and longitudinal conductivity is established, a corresponding resistivity tensor is derived, and the electrical resistivity of the current transformer is calculated through a Maxwell equation set and a generalized Laplacian equation. A control equation of a stable current field in the anisotropic medium is established, systematic description of the conduction rule of the current in the orthotropic medium is achieved, the limitation that a traditional method depends on isotropic hypothesis is overcome from the theoretical root, and a rigorous mathematical physical foundation is laid for accurate characterization of the electrical anisotropy of a complex reservoir core.

The invention relates to an anisotropic carbon fiber reinforced epoxy resin composite material and a preparation method thereof, and the carbon fiber reinforced epoxy resin composite material has good rigidity, toughness and anisotropic conductivity. Comprising an epoxy resin matrix material and short carbon fibers with nickel microneedles modified on the surface, wherein the short carbon fibers are distributed in the epoxy resin matrix material in an oriented manner; the mass percentage content of the short carbon fiber with the surface modified by the nickel microneedle relative to the epoxy resin matrix material is 0.1-20%. The anisotropic carbon fiber reinforced epoxy resin composite material contains the short carbon fibers with the surfaces modified by the nickel microneedles, and the short carbon fibers with the surfaces modified by the nickel microneedles not only can be uniformly dispersed in an epoxy resin matrix material, but also can be distributed in the epoxy resin matrix material in an oriented manner; therefore, a conductive path can be formed in the epoxy resin matrix material, and the epoxy resin matrix material has relatively high conductivity; and the strength, modulus and toughness of the composite material are improved.